How to move selected UV Island?
You need to set the context's area type first, run the folowing script from the text editor not from the console:

import bpy
area = bpy.context.area.type
bpy.context.area.type = 'IMAGE_EDITOR'
bpy.ops.transform.translate(value=(-0.209548, 0.232831, 0), constraint_axis=(False, False, False), constraint_orientation='GLOBAL', mirror=False, proportional='DISABLED', proportional_edit_falloff='SMOOTH', proportional_size=1)
bpy.context.area.type = area


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